<SEC-DOCUMENT>0000350894-23-000017-index.html : 20230224
<SEC-HEADER>0000350894-23-000017.hdr.sgml : 20230224
<ACCEPTANCE-DATETIME>20230224131529
ACCESSION NUMBER:		0000350894-23-000017
CONFORMED SUBMISSION TYPE:	10-K/A
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20221231
FILED AS OF DATE:		20230224
DATE AS OF CHANGE:		20230224

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEI INVESTMENTS CO
		CENTRAL INDEX KEY:			0000350894
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		IRS NUMBER:				231707341
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		10-K/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-10200
		FILM NUMBER:		23665358

	BUSINESS ADDRESS:	
		STREET 1:		1 FREEDOM VALLEY DRIVE
		CITY:			OAKS
		STATE:			PA
		ZIP:			19456-1100
		BUSINESS PHONE:		6106761000

	MAIL ADDRESS:	
		STREET 1:		1 FREEDOM VALLEY DRIVE
		CITY:			OAKS
		STATE:			PA
		ZIP:			19456-1100

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEI INVESTMENT CO
		DATE OF NAME CHANGE:	20040806

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SEI CORP
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>10-K/A
<SEQUENCE>1
<FILENAME>seic-12312022form10xka.htm
<DESCRIPTION>FORM 10-K/A
<TEXT>
Document 1 - file: seic-12312022form10xka.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>2
<FILENAME>seic-1231202210kaex311.htm
<DESCRIPTION>SECTION 302 PRINCIPAL EXECUTIVE OFFICER CERTIFICATION
<TEXT>
Document 2 - file: seic-1231202210kaex311.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>3
<FILENAME>seic-1231202210kaex312.htm
<DESCRIPTION>SECTION 302 PRINCIPAL FINANCIAL OFFICER CERTIFICATION
<TEXT>
Document 3 - file: seic-1231202210kaex312.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>seilogo.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: seilogo.jpg

</DOCUMENT>
</SEC-DOCUMENT>